President Trump has repeatedly described the U.S.-Canada border as an "artificially drawn line." But experts say just because it was man-made doesn't mean it's not legitimate.

Jody Stone, mayor of the village of Stanstead, Quebec, stood inside the Haskell Free Library & Opera House, where a black line runs across the floor to mark the US-Canada border.

This will be the second major wave of active-duty troops sent to secure the border since Mr. Trump took office on Jan. 20. About 1,600 Marines and Army soldiers arrived soon after the inauguration ...

President Trump has repeatedly described the U.S.-Canada border as an "artificially drawn line." But experts say just because it was man-made doesn't mean it's not legitimate.